NDLI: Inside-out Ostwald ripening: A facile process towards synthesizing anatase TiO$_{2}$ microspheres for high-efficiency dye-sensitized solar cells

Content Provider	Springer Nature Link
Author	Ding, Yong Xia, Xin Chen, Wangchao Hu, Linhua Mo, Li’e Huang, Yang Dai, Songyuan
Copyright Year	2016
Abstract	A facile inside-out Ostwald ripening route to the morphology-controlled preparation of TiO$_{2}$ microspheres is developed. Here, TiO$_{2}$ hollow microspheres (HM) and solid microspheres (SM) are prepared by adjusting the volume ratio of isopropanol (IPA) to acetylacetone (Acac) in the solvothermal process. During the formation process of HM, precipitation of solid cores, subsequent deposition of outer shells on the surface of cores, and simultaneous core dissolution and shell recrystallization are observed, which validate the inside-out Ostwald ripening mechanism. Design and optimization of the properties (pore size, surface area, and trap state) of TiO$_{2}$ microspheres are vital to the high performance of dyesensitized solar cells (DSSCs). The optimized TiO$_{2}$ microspheres (rHM and rSM) obtained by post-processing on recrystallization, possess large pore sizes, high surface areas and reduced trap states (Ti$^{3+}$ and oxygen vacancy), and are thus ideal materials for photovoltaic devices. The power conversion efficiency of DSSCs fabricated using rHM photoanode is 11.22%, which is significantly improved compared with the 10.54% efficiency of the rSM-based DSSC. Our work provides a strategy for synthesizing TiO$_{2}$ microspheres that simultaneously accommodate different physical properties, in terms of surface area, crystallinity, morphology, and mesoporosity.
Starting Page	1891
Ending Page	1903
Page Count	13
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	9
Issue Number	7
e-ISSN	19980000
Language	English
Publisher	Tsinghua University Press
Publisher Date	2016-05-10
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ostwald ripening dye-sensitized solar cell TiO$_{2}$ microsphere hollow structure acetylacetone Nanotechnology Materials Science Atomic/Molecular Structure and Spectra Condensed Matter Physics Biotechnology Biomedicine
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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